Lena was two years old when she started to drink a lot of water. After a long, uncertain and anxious time, she was diagnosed with Diabetes Insipidus or 'water diabetes'. After further examinations it became clear that Lena suffers from the very rare disease LCH (Langerhans cell histiocytosis). The consequences are usually treatable, but the cause is still unknown. Since Lena and her brother Remo are still so small, it is difficult...